Communications: electrical – Digital comparator systems
Patent
1976-04-23
1977-05-31
Yusko, Donald J.
Communications: electrical
Digital comparator systems
340310R, 340408, G08B 2100, H04Q 900
Patent
active
040272869
ABSTRACT:
A multiplexed data monitoring system for use in monitoring the status of control valves or the like in subsea petroleum well control systems, utilizes an encoder circuit located externally of the control module and composed of passive electrical components, such as inductors and capacitors, to encode switch contact closure or status information into discrete frequency data. The external encoder circuit is coupled by a pair of wires to the control module.
The decoder circuitry within the subsea control module applies an alternating current signal of varying frequency to the encoder circuit and by monitoring the phase of the alternating current, the decoder circuitry can recover the data impressed by the switch contacts at the status points, which are also located externally of the control module.
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patent: 3461428 (1969-08-01), Anderson
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patent: 3551890 (1970-12-01), Silverman
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patent: 3766540 (1973-10-01), Schopfer et al.
patent: 3895369 (1975-07-01), Ono et al.
patent: 3938129 (1976-02-01), Smither
Connors J. J.
Dinardo J. A.
Oser E. A.
TRW Inc.
Yusko Donald J.
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